[issue10021] Format parser is too permissive

[Eric Smith]

Eric Smith <eric at trueblade.com> added the comment:

I agree that it being an implementation detail is not a good thing. I think we should just document the current CPython behavior as the language standard: once parsed, any string after a dot is passed to getattr. I can't see why we should pay the penalty of validating it as an identifier when the behavior is well defined and matches my getattr example in msg 117965.

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<http://bugs.python.org/issue10021>
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